did they get better?
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HT4100 4.1, 4.5, 4.9 Discussion, did they get better? in Cadillac Engine Technical Discussion; I think I remember reading that the 4.1 improved in it's last years, would appreciate any info on this, was ...
  1. #1
    creeker is offline Cadillac Owners Connoisseur
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    did they get better?

    I think I remember reading that the 4.1 improved in it's last years, would appreciate any info on this, was there some engineering improvements
    in it's latter years, theres an 85 cdv. for sale in my area for a good price,
    is it worth the risk?.

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  3. #2
    Sevillian273's Avatar
    Sevillian273 is offline Cadillac Owners Connoisseur
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    Re: did they get better?

    Yeah it got better in 1988 when it became a 4.5!

  4. #3
    creeker is offline Cadillac Owners Connoisseur
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    Re: did they get better?

    Quote Originally Posted by Sevillian273 View Post
    Yeah it got better in 1988 when it became a 4.5!
    Thanks,my question was kinda rhetorical.

  5. #4
    quins90lac's Avatar
    quins90lac is offline Cadillac Owners Enthusiast
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    Re: did they get better?

    4.5s are great i know i love mine

  6. #5
    creeker is offline Cadillac Owners Connoisseur
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    Re: did they get better?

    Quote Originally Posted by quins90lac View Post
    4.5s are great i know i love mine
    Yeh I know, I trust both the 4.5 and 4.9.

  7. #6
    ehall's Avatar
    ehall is offline Cadillac Owners Connoisseur
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    Re: did they get better?

    The FWD 4.1s were adequate. My 85 4.1 has been pretty good except for the aluminum rockers. However they have the same part number as the rockers on the 4.5 and 4.9 so that's not specific to the 4.1.

  8. #7
    JoJo_Brand_Star is offline Cadillac Owners Member
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    Re: did they get better?

    let's just say i miss my 4.5 and my 4.9 motor. haha

  9. #8
    ehall's Avatar
    ehall is offline Cadillac Owners Connoisseur
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    Re: did they get better?

    Did the later models have trouble with the intake gasket? My 4.1 had a sporadic oil leak until the intake manifold gasket was changed and hasn't lost a drop of oil since.

  10. #9
    drewsdeville's Avatar
    drewsdeville is offline Cadillac Owners Master
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    Re: did they get better?

    Yes, the intake leaks were inherent to the design and couldn't be "patched". With an aluminum intake mated to iron heads, the different thermal properties of each part raised the likelihood of gasket failure.

  11. #10
    steelybill is offline Cadillac Owners Enthusiast
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    Re: did they get better?

    On the same note, the later Chevy engines in pickups and vans had an aluminum manifold on iron heads with the same problem. I've replace a bunch of gaskets in those too.

    When I was thinking about replacing my 4.1 with a rebuilt engine, the engine rebuilder told me I should get the manifold milled off a bit to insure that it wasn't warped.
    I haven't had that problem with my 4.1.
    He also told me that for another 300 bucks they could make it a 4.5, and it would work OK in my car.

  12. #11
    ehall's Avatar
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    Re: did they get better?

    How many high-miler 4.9s have had to do multiple gasket replacements over their lifetime

  13. #12
    drewsdeville's Avatar
    drewsdeville is offline Cadillac Owners Master
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    Re: did they get better?

    I've only had one failure on my '90 4.5, it leaked vacuum around one intake port.

    I replaced the intake gaskets on my '95 4.9 70k miles ago when I first got it only because I replaced all the top end gaskets to give myself a "Fresh" start. Never failed since. The originals looked ok at the time, not sure if they would have failed by now or not.

    Dad's '89 4.5 has 190,000 and still has all original gaskets with no leaks. Seems hit or miss with these.

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